She's a singer of low songs (9)
I believe the answer is:
contralto
'she's a singer of low songs' is the definition.
I can't judge whether this defines the answer.
'she's a singer of low' is the wordplay.
'she' becomes 'Con'.
'a singer of' becomes 'tr' (I can't justify this - if you can you should give a lot more credence to this answer).
'low' becomes 'alto' (similar in meaning).
'con'+'tr'+'alto'='CONTRALTO'
Can you help me to learn more?
(Other definitions for contralto that I've seen before include "Lowest female singer" , "deep, for women" , "Lowest range for a woman singer" , "Female voice of the lower register." , "Lowest female singing voice" .)